http://www.fueleconomy.gov/feg/sbs.htm
if it doesn't come up for your specific vehicle, just pull it up yourself & it will give you an idea what to expect, but driving conditions and style makes all the difference. I am (sometimes) getting 28mpg on my "big white boat" 93 Lincoln w 4.6 V8 and guilty of getting less then stellar with my 1.9 - 5sp Escort when I drive (well used to
) like a teenager.